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opa842跟随问题

Other Parts Discussed in Thread: OPA842

我用opa842连了个简单的跟随器,就是输出端直接反馈到反向端,为什么输出会衰减为一半?

第二个问题,用opa842连个同相放大器(反馈网络电阻为1:1),为什么输出会放大十倍甚至几十?